<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>修改主轴方向</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        .father {


            width: 200px;
            height: 200px;
            background-color: #86f945;

            margin: 100px auto;

            display: flex;
            flex-direction: column;

            justify-content: center;
            align-items: center;
        }

        .father div {
            width: 50px;
            height: 50px;
            background-color: #a73434;
            border-radius: 50%;
        }

        .father p {
            color: black;
        }


    </style>
</head>
<body>
<div class="father">
    <div></div>
    <p>中心</p>
</div>
</body>
</html>